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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /gfx/thebes/gfxFontUtils.cpp
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/thebes/gfxFontUtils.cpp')
-rw-r--r--gfx/thebes/gfxFontUtils.cpp1791
1 files changed, 1791 insertions, 0 deletions
diff --git a/gfx/thebes/gfxFontUtils.cpp b/gfx/thebes/gfxFontUtils.cpp
new file mode 100644
index 0000000000..02543607cd
--- /dev/null
+++ b/gfx/thebes/gfxFontUtils.cpp
@@ -0,0 +1,1791 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/BinarySearch.h"
+
+#include "gfxFontUtils.h"
+#include "gfxFontEntry.h"
+#include "gfxFontVariations.h"
+#include "gfxUtils.h"
+
+#include "nsServiceManagerUtils.h"
+
+#include "mozilla/Preferences.h"
+#include "mozilla/BinarySearch.h"
+#include "mozilla/Sprintf.h"
+#include "mozilla/Unused.h"
+
+#include "nsCOMPtr.h"
+#include "nsIUUIDGenerator.h"
+#include "mozilla/Encoding.h"
+
+#include "mozilla/ServoStyleSet.h"
+#include "mozilla/dom/WorkerCommon.h"
+
+#include "plbase64.h"
+#include "mozilla/Logging.h"
+
+#ifdef XP_MACOSX
+# include <CoreFoundation/CoreFoundation.h>
+#endif
+
+#define LOG(log, args) MOZ_LOG(gfxPlatform::GetLog(log), LogLevel::Debug, args)
+
+#define UNICODE_BMP_LIMIT 0x10000
+
+using namespace mozilla;
+
+#pragma pack(1)
+
+typedef struct {
+ AutoSwap_PRUint16 format;
+ AutoSwap_PRUint16 reserved;
+ AutoSwap_PRUint32 length;
+ AutoSwap_PRUint32 language;
+ AutoSwap_PRUint32 startCharCode;
+ AutoSwap_PRUint32 numChars;
+} Format10CmapHeader;
+
+typedef struct {
+ AutoSwap_PRUint16 format;
+ AutoSwap_PRUint16 reserved;
+ AutoSwap_PRUint32 length;
+ AutoSwap_PRUint32 language;
+ AutoSwap_PRUint32 numGroups;
+} Format12CmapHeader;
+
+typedef struct {
+ AutoSwap_PRUint32 startCharCode;
+ AutoSwap_PRUint32 endCharCode;
+ AutoSwap_PRUint32 startGlyphId;
+} Format12Group;
+
+#pragma pack()
+
+void gfxSparseBitSet::Dump(const char* aPrefix, eGfxLog aWhichLog) const {
+ uint32_t numBlocks = mBlockIndex.Length();
+
+ for (uint32_t b = 0; b < numBlocks; b++) {
+ if (mBlockIndex[b] == NO_BLOCK) {
+ continue;
+ }
+ const Block* block = &mBlocks[mBlockIndex[b]];
+ const int BUFSIZE = 256;
+ char outStr[BUFSIZE];
+ int index = 0;
+ index += snprintf(&outStr[index], BUFSIZE - index, "%s u+%6.6x [", aPrefix,
+ (b * BLOCK_SIZE_BITS));
+ for (int i = 0; i < 32; i += 4) {
+ for (int j = i; j < i + 4; j++) {
+ uint8_t bits = block->mBits[j];
+ uint8_t flip1 = ((bits & 0xaa) >> 1) | ((bits & 0x55) << 1);
+ uint8_t flip2 = ((flip1 & 0xcc) >> 2) | ((flip1 & 0x33) << 2);
+ uint8_t flipped = ((flip2 & 0xf0) >> 4) | ((flip2 & 0x0f) << 4);
+
+ index += snprintf(&outStr[index], BUFSIZE - index, "%2.2x", flipped);
+ }
+ if (i + 4 != 32) index += snprintf(&outStr[index], BUFSIZE - index, " ");
+ }
+ Unused << snprintf(&outStr[index], BUFSIZE - index, "]");
+ LOG(aWhichLog, ("%s", outStr));
+ }
+}
+
+nsresult gfxFontUtils::ReadCMAPTableFormat10(const uint8_t* aBuf,
+ uint32_t aLength,
+ gfxSparseBitSet& aCharacterMap) {
+ // Ensure table is large enough that we can safely read the header
+ NS_ENSURE_TRUE(aLength >= sizeof(Format10CmapHeader),
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ // Sanity-check header fields
+ const Format10CmapHeader* cmap10 =
+ reinterpret_cast<const Format10CmapHeader*>(aBuf);
+ NS_ENSURE_TRUE(uint16_t(cmap10->format) == 10, NS_ERROR_GFX_CMAP_MALFORMED);
+ NS_ENSURE_TRUE(uint16_t(cmap10->reserved) == 0, NS_ERROR_GFX_CMAP_MALFORMED);
+
+ uint32_t tablelen = cmap10->length;
+ NS_ENSURE_TRUE(tablelen >= sizeof(Format10CmapHeader) && tablelen <= aLength,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ NS_ENSURE_TRUE(cmap10->language == 0, NS_ERROR_GFX_CMAP_MALFORMED);
+
+ uint32_t numChars = cmap10->numChars;
+ NS_ENSURE_TRUE(
+ tablelen == sizeof(Format10CmapHeader) + numChars * sizeof(uint16_t),
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ uint32_t charCode = cmap10->startCharCode;
+ NS_ENSURE_TRUE(charCode <= CMAP_MAX_CODEPOINT &&
+ charCode + numChars <= CMAP_MAX_CODEPOINT,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ // glyphs[] array immediately follows the subtable header
+ const AutoSwap_PRUint16* glyphs =
+ reinterpret_cast<const AutoSwap_PRUint16*>(cmap10 + 1);
+
+ for (uint32_t i = 0; i < numChars; ++i) {
+ if (uint16_t(*glyphs) != 0) {
+ aCharacterMap.set(charCode);
+ }
+ ++charCode;
+ ++glyphs;
+ }
+
+ aCharacterMap.Compact();
+
+ return NS_OK;
+}
+
+nsresult gfxFontUtils::ReadCMAPTableFormat12or13(
+ const uint8_t* aBuf, uint32_t aLength, gfxSparseBitSet& aCharacterMap) {
+ // Format 13 has the same structure as format 12, the only difference is
+ // the interpretation of the glyphID field. So we can share the code here
+ // that reads the table and just records character coverage.
+
+ // Ensure table is large enough that we can safely read the header
+ NS_ENSURE_TRUE(aLength >= sizeof(Format12CmapHeader),
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ // Sanity-check header fields
+ const Format12CmapHeader* cmap12 =
+ reinterpret_cast<const Format12CmapHeader*>(aBuf);
+ NS_ENSURE_TRUE(
+ uint16_t(cmap12->format) == 12 || uint16_t(cmap12->format) == 13,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+ NS_ENSURE_TRUE(uint16_t(cmap12->reserved) == 0, NS_ERROR_GFX_CMAP_MALFORMED);
+
+ uint32_t tablelen = cmap12->length;
+ NS_ENSURE_TRUE(tablelen >= sizeof(Format12CmapHeader) && tablelen <= aLength,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ NS_ENSURE_TRUE(cmap12->language == 0, NS_ERROR_GFX_CMAP_MALFORMED);
+
+ // Check that the table is large enough for the group array
+ const uint32_t numGroups = cmap12->numGroups;
+ NS_ENSURE_TRUE(
+ (tablelen - sizeof(Format12CmapHeader)) / sizeof(Format12Group) >=
+ numGroups,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ // The array of groups immediately follows the subtable header.
+ const Format12Group* group =
+ reinterpret_cast<const Format12Group*>(aBuf + sizeof(Format12CmapHeader));
+
+ // Check that groups are in correct order and do not overlap,
+ // and record character coverage in aCharacterMap.
+ uint32_t prevEndCharCode = 0;
+ for (uint32_t i = 0; i < numGroups; i++, group++) {
+ uint32_t startCharCode = group->startCharCode;
+ const uint32_t endCharCode = group->endCharCode;
+ NS_ENSURE_TRUE((prevEndCharCode < startCharCode || i == 0) &&
+ startCharCode <= endCharCode &&
+ endCharCode <= CMAP_MAX_CODEPOINT,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+ // don't include a character that maps to glyph ID 0 (.notdef)
+ if (group->startGlyphId == 0) {
+ startCharCode++;
+ }
+ if (startCharCode <= endCharCode) {
+ aCharacterMap.SetRange(startCharCode, endCharCode);
+ }
+ prevEndCharCode = endCharCode;
+ }
+
+ aCharacterMap.Compact();
+
+ return NS_OK;
+}
+
+nsresult gfxFontUtils::ReadCMAPTableFormat4(const uint8_t* aBuf,
+ uint32_t aLength,
+ gfxSparseBitSet& aCharacterMap,
+ bool aIsSymbolFont) {
+ enum {
+ OffsetFormat = 0,
+ OffsetLength = 2,
+ OffsetLanguage = 4,
+ OffsetSegCountX2 = 6
+ };
+
+ NS_ENSURE_TRUE(ReadShortAt(aBuf, OffsetFormat) == 4,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+ uint16_t tablelen = ReadShortAt(aBuf, OffsetLength);
+ NS_ENSURE_TRUE(tablelen <= aLength, NS_ERROR_GFX_CMAP_MALFORMED);
+ NS_ENSURE_TRUE(tablelen > 16, NS_ERROR_GFX_CMAP_MALFORMED);
+
+ // This field should normally (except for Mac platform subtables) be zero
+ // according to the OT spec, but some buggy fonts have lang = 1 (which would
+ // be English for MacOS). E.g. Arial Narrow Bold, v. 1.1 (Tiger), Arial
+ // Unicode MS (see bug 530614). So accept either zero or one here; the error
+ // should be harmless.
+ NS_ENSURE_TRUE((ReadShortAt(aBuf, OffsetLanguage) & 0xfffe) == 0,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ uint16_t segCountX2 = ReadShortAt(aBuf, OffsetSegCountX2);
+ NS_ENSURE_TRUE(tablelen >= 16 + (segCountX2 * 4),
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ const uint16_t segCount = segCountX2 / 2;
+
+ const uint16_t* endCounts = reinterpret_cast<const uint16_t*>(aBuf + 14);
+ const uint16_t* startCounts =
+ endCounts + 1 /* skip one uint16_t for reservedPad */ + segCount;
+ const uint16_t* idDeltas = startCounts + segCount;
+ const uint16_t* idRangeOffsets = idDeltas + segCount;
+ uint16_t prevEndCount = 0;
+ for (uint16_t i = 0; i < segCount; i++) {
+ const uint16_t endCount = ReadShortAt16(endCounts, i);
+ const uint16_t startCount = ReadShortAt16(startCounts, i);
+ const uint16_t idRangeOffset = ReadShortAt16(idRangeOffsets, i);
+
+ // sanity-check range
+ // This permits ranges to overlap by 1 character, which is strictly
+ // incorrect but occurs in Baskerville on OS X 10.7 (see bug 689087),
+ // and appears to be harmless in practice
+ NS_ENSURE_TRUE(startCount >= prevEndCount && startCount <= endCount,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+ prevEndCount = endCount;
+
+ if (idRangeOffset == 0) {
+ // figure out if there's a code in the range that would map to
+ // glyph ID 0 (.notdef); if so, we need to skip setting that
+ // character code in the map
+ const uint16_t skipCode = 65536 - ReadShortAt16(idDeltas, i);
+ if (startCount < skipCode) {
+ aCharacterMap.SetRange(startCount,
+ std::min<uint16_t>(skipCode - 1, endCount));
+ }
+ if (skipCode < endCount) {
+ aCharacterMap.SetRange(std::max<uint16_t>(startCount, skipCode + 1),
+ endCount);
+ }
+ } else {
+ // Unused: self-documenting.
+ // const uint16_t idDelta = ReadShortAt16(idDeltas, i);
+ for (uint32_t c = startCount; c <= endCount; ++c) {
+ if (c == 0xFFFF) break;
+
+ const uint16_t* gdata =
+ (idRangeOffset / 2 + (c - startCount) + &idRangeOffsets[i]);
+
+ NS_ENSURE_TRUE(
+ (uint8_t*)gdata > aBuf && (uint8_t*)gdata < aBuf + aLength,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ // make sure we have a glyph
+ if (*gdata != 0) {
+ // The glyph index at this point is:
+ uint16_t glyph = ReadShortAt16(idDeltas, i) + *gdata;
+ if (glyph) {
+ aCharacterMap.set(c);
+ }
+ }
+ }
+ }
+ }
+
+ if (aIsSymbolFont) {
+ // For fonts with "MS Symbol" encoding, we duplicate character mappings in
+ // the U+F0xx range down to U+00xx codepoints, so as to support fonts such
+ // as Wingdings.
+ // Note that if the font actually has cmap coverage for the U+00xx range
+ // (either duplicating the PUA codepoints or mapping to separate glyphs),
+ // this will not affect it.
+ for (uint32_t c = 0x0020; c <= 0x00ff; ++c) {
+ if (aCharacterMap.test(0xf000 + c)) {
+ aCharacterMap.set(c);
+ }
+ }
+ }
+
+ aCharacterMap.Compact();
+
+ return NS_OK;
+}
+
+nsresult gfxFontUtils::ReadCMAPTableFormat14(const uint8_t* aBuf,
+ uint32_t aLength,
+ const uint8_t*& aTable) {
+ enum {
+ OffsetFormat = 0,
+ OffsetTableLength = 2,
+ OffsetNumVarSelectorRecords = 6,
+ OffsetVarSelectorRecords = 10,
+
+ SizeOfVarSelectorRecord = 11,
+ VSRecOffsetVarSelector = 0,
+ VSRecOffsetDefUVSOffset = 3,
+ VSRecOffsetNonDefUVSOffset = 7,
+
+ SizeOfDefUVSTable = 4,
+ DefUVSOffsetStartUnicodeValue = 0,
+ DefUVSOffsetAdditionalCount = 3,
+
+ SizeOfNonDefUVSTable = 5,
+ NonDefUVSOffsetUnicodeValue = 0,
+ NonDefUVSOffsetGlyphID = 3
+ };
+ NS_ENSURE_TRUE(aLength >= OffsetVarSelectorRecords,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ NS_ENSURE_TRUE(ReadShortAt(aBuf, OffsetFormat) == 14,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ uint32_t tablelen = ReadLongAt(aBuf, OffsetTableLength);
+ NS_ENSURE_TRUE(tablelen <= aLength, NS_ERROR_GFX_CMAP_MALFORMED);
+ NS_ENSURE_TRUE(tablelen >= OffsetVarSelectorRecords,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ const uint32_t numVarSelectorRecords =
+ ReadLongAt(aBuf, OffsetNumVarSelectorRecords);
+ NS_ENSURE_TRUE(
+ (tablelen - OffsetVarSelectorRecords) / SizeOfVarSelectorRecord >=
+ numVarSelectorRecords,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ const uint8_t* records = aBuf + OffsetVarSelectorRecords;
+ for (uint32_t i = 0; i < numVarSelectorRecords;
+ i++, records += SizeOfVarSelectorRecord) {
+ const uint32_t varSelector = ReadUint24At(records, VSRecOffsetVarSelector);
+ const uint32_t defUVSOffset = ReadLongAt(records, VSRecOffsetDefUVSOffset);
+ const uint32_t nonDefUVSOffset =
+ ReadLongAt(records, VSRecOffsetNonDefUVSOffset);
+ NS_ENSURE_TRUE(varSelector <= CMAP_MAX_CODEPOINT &&
+ defUVSOffset <= tablelen - 4 &&
+ nonDefUVSOffset <= tablelen - 4,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+
+ if (defUVSOffset) {
+ const uint32_t numUnicodeValueRanges = ReadLongAt(aBuf, defUVSOffset);
+ NS_ENSURE_TRUE((tablelen - defUVSOffset) / SizeOfDefUVSTable >=
+ numUnicodeValueRanges,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+ const uint8_t* tables = aBuf + defUVSOffset + 4;
+ uint32_t prevEndUnicode = 0;
+ for (uint32_t j = 0; j < numUnicodeValueRanges;
+ j++, tables += SizeOfDefUVSTable) {
+ const uint32_t startUnicode =
+ ReadUint24At(tables, DefUVSOffsetStartUnicodeValue);
+ const uint32_t endUnicode =
+ startUnicode + tables[DefUVSOffsetAdditionalCount];
+ NS_ENSURE_TRUE((prevEndUnicode < startUnicode || j == 0) &&
+ endUnicode <= CMAP_MAX_CODEPOINT,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+ prevEndUnicode = endUnicode;
+ }
+ }
+
+ if (nonDefUVSOffset) {
+ const uint32_t numUVSMappings = ReadLongAt(aBuf, nonDefUVSOffset);
+ NS_ENSURE_TRUE(
+ (tablelen - nonDefUVSOffset) / SizeOfNonDefUVSTable >= numUVSMappings,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+ const uint8_t* tables = aBuf + nonDefUVSOffset + 4;
+ uint32_t prevUnicode = 0;
+ for (uint32_t j = 0; j < numUVSMappings;
+ j++, tables += SizeOfNonDefUVSTable) {
+ const uint32_t unicodeValue =
+ ReadUint24At(tables, NonDefUVSOffsetUnicodeValue);
+ NS_ENSURE_TRUE((prevUnicode < unicodeValue || j == 0) &&
+ unicodeValue <= CMAP_MAX_CODEPOINT,
+ NS_ERROR_GFX_CMAP_MALFORMED);
+ prevUnicode = unicodeValue;
+ }
+ }
+ }
+
+ uint8_t* table = new uint8_t[tablelen];
+ memcpy(table, aBuf, tablelen);
+
+ aTable = static_cast<const uint8_t*>(table);
+
+ return NS_OK;
+}
+
+// For fonts with two format-4 tables, the first one (Unicode platform) is
+// preferred on the Mac; on other platforms we allow the Microsoft-platform
+// subtable to replace it.
+
+#if defined(XP_MACOSX)
+# define acceptableFormat4(p, e, k) \
+ (((p) == PLATFORM_ID_MICROSOFT && (e) == EncodingIDMicrosoft && !(k)) || \
+ ((p) == PLATFORM_ID_UNICODE))
+
+# define acceptableUCS4Encoding(p, e, k) \
+ (((p) == PLATFORM_ID_MICROSOFT && \
+ (e) == EncodingIDUCS4ForMicrosoftPlatform) && \
+ (k) != 12 || \
+ ((p) == PLATFORM_ID_UNICODE && ((e) != EncodingIDUVSForUnicodePlatform)))
+#else
+# define acceptableFormat4(p, e, k) \
+ (((p) == PLATFORM_ID_MICROSOFT && (e) == EncodingIDMicrosoft) || \
+ ((p) == PLATFORM_ID_UNICODE))
+
+# define acceptableUCS4Encoding(p, e, k) \
+ ((p) == PLATFORM_ID_MICROSOFT && (e) == EncodingIDUCS4ForMicrosoftPlatform)
+#endif
+
+#define acceptablePlatform(p) \
+ ((p) == PLATFORM_ID_UNICODE || (p) == PLATFORM_ID_MICROSOFT)
+#define isSymbol(p, e) ((p) == PLATFORM_ID_MICROSOFT && (e) == EncodingIDSymbol)
+#define isUVSEncoding(p, e) \
+ ((p) == PLATFORM_ID_UNICODE && (e) == EncodingIDUVSForUnicodePlatform)
+
+uint32_t gfxFontUtils::FindPreferredSubtable(const uint8_t* aBuf,
+ uint32_t aBufLength,
+ uint32_t* aTableOffset,
+ uint32_t* aUVSTableOffset,
+ bool* aIsSymbolFont) {
+ enum {
+ OffsetVersion = 0,
+ OffsetNumTables = 2,
+ SizeOfHeader = 4,
+
+ TableOffsetPlatformID = 0,
+ TableOffsetEncodingID = 2,
+ TableOffsetOffset = 4,
+ SizeOfTable = 8,
+
+ SubtableOffsetFormat = 0
+ };
+ enum {
+ EncodingIDSymbol = 0,
+ EncodingIDMicrosoft = 1,
+ EncodingIDDefaultForUnicodePlatform = 0,
+ EncodingIDUCS4ForUnicodePlatform = 3,
+ EncodingIDUVSForUnicodePlatform = 5,
+ EncodingIDUCS4ForMicrosoftPlatform = 10
+ };
+
+ if (aUVSTableOffset) {
+ *aUVSTableOffset = 0;
+ }
+ if (aIsSymbolFont) {
+ *aIsSymbolFont = false;
+ }
+
+ if (!aBuf || aBufLength < SizeOfHeader) {
+ // cmap table is missing, or too small to contain header fields!
+ return 0;
+ }
+
+ // uint16_t version = ReadShortAt(aBuf, OffsetVersion); // Unused:
+ // self-documenting.
+ uint16_t numTables = ReadShortAt(aBuf, OffsetNumTables);
+ if (aBufLength < uint32_t(SizeOfHeader + numTables * SizeOfTable)) {
+ return 0;
+ }
+
+ // save the format we want here
+ uint32_t keepFormat = 0;
+
+ const uint8_t* table = aBuf + SizeOfHeader;
+ for (uint16_t i = 0; i < numTables; ++i, table += SizeOfTable) {
+ const uint16_t platformID = ReadShortAt(table, TableOffsetPlatformID);
+ if (!acceptablePlatform(platformID)) continue;
+
+ const uint16_t encodingID = ReadShortAt(table, TableOffsetEncodingID);
+ const uint32_t offset = ReadLongAt(table, TableOffsetOffset);
+ if (aBufLength - 2 < offset) {
+ // this subtable is not valid - beyond end of buffer
+ return 0;
+ }
+
+ const uint8_t* subtable = aBuf + offset;
+ const uint16_t format = ReadShortAt(subtable, SubtableOffsetFormat);
+
+ if (isSymbol(platformID, encodingID)) {
+ keepFormat = format;
+ *aTableOffset = offset;
+ if (aIsSymbolFont) {
+ *aIsSymbolFont = true;
+ }
+ break;
+ } else if (format == 4 &&
+ acceptableFormat4(platformID, encodingID, keepFormat)) {
+ keepFormat = format;
+ *aTableOffset = offset;
+ } else if ((format == 10 || format == 12 || format == 13) &&
+ acceptableUCS4Encoding(platformID, encodingID, keepFormat)) {
+ keepFormat = format;
+ *aTableOffset = offset;
+ if (platformID > PLATFORM_ID_UNICODE || !aUVSTableOffset ||
+ *aUVSTableOffset) {
+ break; // we don't want to try anything else when this format is
+ // available.
+ }
+ } else if (format == 14 && isUVSEncoding(platformID, encodingID) &&
+ aUVSTableOffset) {
+ *aUVSTableOffset = offset;
+ if (keepFormat == 10 || keepFormat == 12) {
+ break;
+ }
+ }
+ }
+
+ return keepFormat;
+}
+
+nsresult gfxFontUtils::ReadCMAP(const uint8_t* aBuf, uint32_t aBufLength,
+ gfxSparseBitSet& aCharacterMap,
+ uint32_t& aUVSOffset) {
+ uint32_t offset;
+ bool isSymbolFont;
+ uint32_t format = FindPreferredSubtable(aBuf, aBufLength, &offset,
+ &aUVSOffset, &isSymbolFont);
+
+ switch (format) {
+ case 4:
+ return ReadCMAPTableFormat4(aBuf + offset, aBufLength - offset,
+ aCharacterMap, isSymbolFont);
+
+ case 10:
+ return ReadCMAPTableFormat10(aBuf + offset, aBufLength - offset,
+ aCharacterMap);
+
+ case 12:
+ case 13:
+ return ReadCMAPTableFormat12or13(aBuf + offset, aBufLength - offset,
+ aCharacterMap);
+
+ default:
+ break;
+ }
+
+ return NS_ERROR_FAILURE;
+}
+
+#pragma pack(1)
+
+typedef struct {
+ AutoSwap_PRUint16 format;
+ AutoSwap_PRUint16 length;
+ AutoSwap_PRUint16 language;
+ AutoSwap_PRUint16 segCountX2;
+ AutoSwap_PRUint16 searchRange;
+ AutoSwap_PRUint16 entrySelector;
+ AutoSwap_PRUint16 rangeShift;
+
+ AutoSwap_PRUint16 arrays[1];
+} Format4Cmap;
+
+typedef struct Format14Cmap {
+ AutoSwap_PRUint16 format;
+ AutoSwap_PRUint32 length;
+ AutoSwap_PRUint32 numVarSelectorRecords;
+
+ typedef struct {
+ AutoSwap_PRUint24 varSelector;
+ AutoSwap_PRUint32 defaultUVSOffset;
+ AutoSwap_PRUint32 nonDefaultUVSOffset;
+ } VarSelectorRecord;
+
+ VarSelectorRecord varSelectorRecords[1];
+} Format14Cmap;
+
+typedef struct NonDefUVSTable {
+ AutoSwap_PRUint32 numUVSMappings;
+
+ typedef struct {
+ AutoSwap_PRUint24 unicodeValue;
+ AutoSwap_PRUint16 glyphID;
+ } UVSMapping;
+
+ UVSMapping uvsMappings[1];
+} NonDefUVSTable;
+
+#pragma pack()
+
+uint32_t gfxFontUtils::MapCharToGlyphFormat4(const uint8_t* aBuf,
+ uint32_t aLength, char16_t aCh) {
+ const Format4Cmap* cmap4 = reinterpret_cast<const Format4Cmap*>(aBuf);
+
+ uint16_t segCount = (uint16_t)(cmap4->segCountX2) / 2;
+
+ const AutoSwap_PRUint16* endCodes = &cmap4->arrays[0];
+ const AutoSwap_PRUint16* startCodes = &cmap4->arrays[segCount + 1];
+ const AutoSwap_PRUint16* idDelta = &startCodes[segCount];
+ const AutoSwap_PRUint16* idRangeOffset = &idDelta[segCount];
+
+ // Sanity-check that the fixed-size arrays don't exceed the buffer.
+ const uint8_t* const limit = aBuf + aLength;
+ if ((const uint8_t*)(&idRangeOffset[segCount]) > limit) {
+ return 0; // broken font, just bail out safely
+ }
+
+ // For most efficient binary search, we want to work on a range of segment
+ // indexes that is a power of 2 so that we can always halve it by shifting.
+ // So we find the largest power of 2 that is <= segCount.
+ // We will offset this range by segOffset so as to reach the end
+ // of the table, provided that doesn't put us beyond the target
+ // value from the outset.
+ uint32_t powerOf2 = mozilla::FindHighestBit(segCount);
+ uint32_t segOffset = segCount - powerOf2;
+ uint32_t idx = 0;
+
+ if (uint16_t(startCodes[segOffset]) <= aCh) {
+ idx = segOffset;
+ }
+
+ // Repeatedly halve the size of the range until we find the target group
+ while (powerOf2 > 1) {
+ powerOf2 >>= 1;
+ if (uint16_t(startCodes[idx + powerOf2]) <= aCh) {
+ idx += powerOf2;
+ }
+ }
+
+ if (aCh >= uint16_t(startCodes[idx]) && aCh <= uint16_t(endCodes[idx])) {
+ uint16_t result;
+ if (uint16_t(idRangeOffset[idx]) == 0) {
+ result = aCh;
+ } else {
+ uint16_t offset = aCh - uint16_t(startCodes[idx]);
+ const AutoSwap_PRUint16* glyphIndexTable =
+ (const AutoSwap_PRUint16*)((const char*)&idRangeOffset[idx] +
+ uint16_t(idRangeOffset[idx]));
+ if ((const uint8_t*)(glyphIndexTable + offset + 1) > limit) {
+ return 0; // broken font, just bail out safely
+ }
+ result = glyphIndexTable[offset];
+ }
+
+ // Note that this is unsigned 16-bit arithmetic, and may wrap around
+ // (which is required behavior per spec)
+ result += uint16_t(idDelta[idx]);
+ return result;
+ }
+
+ return 0;
+}
+
+uint32_t gfxFontUtils::MapCharToGlyphFormat10(const uint8_t* aBuf,
+ uint32_t aCh) {
+ const Format10CmapHeader* cmap10 =
+ reinterpret_cast<const Format10CmapHeader*>(aBuf);
+
+ uint32_t startChar = cmap10->startCharCode;
+ uint32_t numChars = cmap10->numChars;
+
+ if (aCh < startChar || aCh >= startChar + numChars) {
+ return 0;
+ }
+
+ const AutoSwap_PRUint16* glyphs =
+ reinterpret_cast<const AutoSwap_PRUint16*>(cmap10 + 1);
+
+ uint16_t glyph = glyphs[aCh - startChar];
+ return glyph;
+}
+
+uint32_t gfxFontUtils::MapCharToGlyphFormat12or13(const uint8_t* aBuf,
+ uint32_t aCh) {
+ // The only difference between formats 12 and 13 is the interpretation of
+ // the glyphId field. So the code here uses the same "Format12" structures,
+ // etc., to handle both subtable formats.
+
+ const Format12CmapHeader* cmap12 =
+ reinterpret_cast<const Format12CmapHeader*>(aBuf);
+
+ // We know that numGroups is within range for the subtable size
+ // because it was checked by ReadCMAPTableFormat12or13.
+ uint32_t numGroups = cmap12->numGroups;
+
+ // The array of groups immediately follows the subtable header.
+ const Format12Group* groups =
+ reinterpret_cast<const Format12Group*>(aBuf + sizeof(Format12CmapHeader));
+
+ // For most efficient binary search, we want to work on a range that
+ // is a power of 2 so that we can always halve it by shifting.
+ // So we find the largest power of 2 that is <= numGroups.
+ // We will offset this range by rangeOffset so as to reach the end
+ // of the table, provided that doesn't put us beyond the target
+ // value from the outset.
+ uint32_t powerOf2 = mozilla::FindHighestBit(numGroups);
+ uint32_t rangeOffset = numGroups - powerOf2;
+ uint32_t range = 0;
+ uint32_t startCharCode;
+
+ if (groups[rangeOffset].startCharCode <= aCh) {
+ range = rangeOffset;
+ }
+
+ // Repeatedly halve the size of the range until we find the target group
+ while (powerOf2 > 1) {
+ powerOf2 >>= 1;
+ if (groups[range + powerOf2].startCharCode <= aCh) {
+ range += powerOf2;
+ }
+ }
+
+ // Check if the character is actually present in the range and return
+ // the corresponding glyph ID. Here is where formats 12 and 13 interpret
+ // the startGlyphId (12) or glyphId (13) field differently
+ startCharCode = groups[range].startCharCode;
+ if (startCharCode <= aCh && groups[range].endCharCode >= aCh) {
+ return uint16_t(cmap12->format) == 12
+ ? uint16_t(groups[range].startGlyphId) + aCh - startCharCode
+ : uint16_t(groups[range].startGlyphId);
+ }
+
+ // Else it's not present, so return the .notdef glyph
+ return 0;
+}
+
+namespace {
+
+struct Format14CmapWrapper {
+ const Format14Cmap& mCmap14;
+ explicit Format14CmapWrapper(const Format14Cmap& cmap14) : mCmap14(cmap14) {}
+ uint32_t operator[](size_t index) const {
+ return mCmap14.varSelectorRecords[index].varSelector;
+ }
+};
+
+struct NonDefUVSTableWrapper {
+ const NonDefUVSTable& mTable;
+ explicit NonDefUVSTableWrapper(const NonDefUVSTable& table) : mTable(table) {}
+ uint32_t operator[](size_t index) const {
+ return mTable.uvsMappings[index].unicodeValue;
+ }
+};
+
+} // namespace
+
+uint16_t gfxFontUtils::MapUVSToGlyphFormat14(const uint8_t* aBuf, uint32_t aCh,
+ uint32_t aVS) {
+ using mozilla::BinarySearch;
+ const Format14Cmap* cmap14 = reinterpret_cast<const Format14Cmap*>(aBuf);
+
+ size_t index;
+ if (!BinarySearch(Format14CmapWrapper(*cmap14), 0,
+ cmap14->numVarSelectorRecords, aVS, &index)) {
+ return 0;
+ }
+
+ const uint32_t nonDefUVSOffset =
+ cmap14->varSelectorRecords[index].nonDefaultUVSOffset;
+ if (!nonDefUVSOffset) {
+ return 0;
+ }
+
+ const NonDefUVSTable* table =
+ reinterpret_cast<const NonDefUVSTable*>(aBuf + nonDefUVSOffset);
+
+ if (BinarySearch(NonDefUVSTableWrapper(*table), 0, table->numUVSMappings, aCh,
+ &index)) {
+ return table->uvsMappings[index].glyphID;
+ }
+
+ return 0;
+}
+
+uint32_t gfxFontUtils::MapCharToGlyph(const uint8_t* aCmapBuf,
+ uint32_t aBufLength, uint32_t aUnicode,
+ uint32_t aVarSelector) {
+ uint32_t offset, uvsOffset;
+ bool isSymbolFont;
+ uint32_t format = FindPreferredSubtable(aCmapBuf, aBufLength, &offset,
+ &uvsOffset, &isSymbolFont);
+
+ uint32_t gid;
+ switch (format) {
+ case 4:
+ gid = aUnicode < UNICODE_BMP_LIMIT
+ ? MapCharToGlyphFormat4(aCmapBuf + offset, aBufLength - offset,
+ char16_t(aUnicode))
+ : 0;
+ if (!gid && isSymbolFont) {
+ if (auto pua = MapLegacySymbolFontCharToPUA(aUnicode)) {
+ gid = MapCharToGlyphFormat4(aCmapBuf + offset, aBufLength - offset,
+ pua);
+ }
+ }
+ break;
+ case 10:
+ gid = MapCharToGlyphFormat10(aCmapBuf + offset, aUnicode);
+ break;
+ case 12:
+ case 13:
+ gid = MapCharToGlyphFormat12or13(aCmapBuf + offset, aUnicode);
+ break;
+ default:
+ NS_WARNING("unsupported cmap format, glyphs will be missing");
+ gid = 0;
+ }
+
+ if (aVarSelector && uvsOffset && gid) {
+ uint32_t varGID = gfxFontUtils::MapUVSToGlyphFormat14(
+ aCmapBuf + uvsOffset, aUnicode, aVarSelector);
+ if (!varGID) {
+ aUnicode = gfxFontUtils::GetUVSFallback(aUnicode, aVarSelector);
+ if (aUnicode) {
+ switch (format) {
+ case 4:
+ if (aUnicode < UNICODE_BMP_LIMIT) {
+ varGID = MapCharToGlyphFormat4(
+ aCmapBuf + offset, aBufLength - offset, char16_t(aUnicode));
+ }
+ break;
+ case 10:
+ varGID = MapCharToGlyphFormat10(aCmapBuf + offset, aUnicode);
+ break;
+ case 12:
+ case 13:
+ varGID = MapCharToGlyphFormat12or13(aCmapBuf + offset, aUnicode);
+ break;
+ }
+ }
+ }
+ if (varGID) {
+ gid = varGID;
+ }
+
+ // else the variation sequence was not supported, use default mapping
+ // of the character code alone
+ }
+
+ return gid;
+}
+
+void gfxFontUtils::ParseFontList(const nsACString& aFamilyList,
+ nsTArray<nsCString>& aFontList) {
+ const char kComma = ',';
+
+ // append each font name to the list
+ nsAutoCString fontname;
+ const char *p, *p_end;
+ aFamilyList.BeginReading(p);
+ aFamilyList.EndReading(p_end);
+
+ while (p < p_end) {
+ const char* nameStart = p;
+ while (++p != p_end && *p != kComma) /* nothing */
+ ;
+
+ // pull out a single name and clean out leading/trailing whitespace
+ fontname = Substring(nameStart, p);
+ fontname.CompressWhitespace(true, true);
+
+ // append it to the list if it's not empty
+ if (!fontname.IsEmpty()) {
+ aFontList.AppendElement(fontname);
+ }
+ ++p;
+ }
+}
+
+void gfxFontUtils::GetPrefsFontList(const char* aPrefName,
+ nsTArray<nsCString>& aFontList,
+ bool aLocalized) {
+ aFontList.Clear();
+
+ nsAutoCString fontlistValue;
+ nsresult rv = aLocalized
+ ? Preferences::GetLocalizedCString(aPrefName, fontlistValue)
+ : Preferences::GetCString(aPrefName, fontlistValue);
+ if (NS_FAILED(rv)) {
+ return;
+ }
+
+ ParseFontList(fontlistValue, aFontList);
+}
+
+// produce a unique font name that is (1) a valid Postscript name and (2) less
+// than 31 characters in length. Using AddFontMemResourceEx on Windows fails
+// for names longer than 30 characters in length.
+
+#define MAX_B64_LEN 32
+
+nsresult gfxFontUtils::MakeUniqueUserFontName(nsAString& aName) {
+ nsCOMPtr<nsIUUIDGenerator> uuidgen =
+ do_GetService("@mozilla.org/uuid-generator;1");
+ NS_ENSURE_TRUE(uuidgen, NS_ERROR_OUT_OF_MEMORY);
+
+ nsID guid;
+
+ NS_ASSERTION(sizeof(guid) * 2 <= MAX_B64_LEN, "size of nsID has changed!");
+
+ nsresult rv = uuidgen->GenerateUUIDInPlace(&guid);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ char guidB64[MAX_B64_LEN] = {0};
+
+ if (!PL_Base64Encode(reinterpret_cast<char*>(&guid), sizeof(guid), guidB64))
+ return NS_ERROR_FAILURE;
+
+ // all b64 characters except for '/' are allowed in Postscript names, so
+ // convert / ==> -
+ char* p;
+ for (p = guidB64; *p; p++) {
+ if (*p == '/') *p = '-';
+ }
+
+ aName.AssignLiteral(u"uf");
+ aName.AppendASCII(guidB64);
+ return NS_OK;
+}
+
+// TrueType/OpenType table handling code
+
+// need byte aligned structs
+#pragma pack(1)
+
+// name table stores set of name record structures, followed by
+// large block containing all the strings. name record offset and length
+// indicates the offset and length within that block.
+// http://www.microsoft.com/typography/otspec/name.htm
+struct NameRecordData {
+ uint32_t offset;
+ uint32_t length;
+};
+
+#pragma pack()
+
+static bool IsValidSFNTVersion(uint32_t version) {
+ // normally 0x00010000, CFF-style OT fonts == 'OTTO' and Apple TT fonts =
+ // 'true' 'typ1' is also possible for old Type 1 fonts in a SFNT container but
+ // not supported
+ return version == 0x10000 || version == TRUETYPE_TAG('O', 'T', 'T', 'O') ||
+ version == TRUETYPE_TAG('t', 'r', 'u', 'e');
+}
+
+gfxUserFontType gfxFontUtils::DetermineFontDataType(const uint8_t* aFontData,
+ uint32_t aFontDataLength) {
+ // test for OpenType font data
+ // problem: EOT-Lite with 0x10000 length will look like TrueType!
+ if (aFontDataLength >= sizeof(SFNTHeader)) {
+ const SFNTHeader* sfntHeader =
+ reinterpret_cast<const SFNTHeader*>(aFontData);
+ uint32_t sfntVersion = sfntHeader->sfntVersion;
+ if (IsValidSFNTVersion(sfntVersion)) {
+ return GFX_USERFONT_OPENTYPE;
+ }
+ }
+
+ // test for WOFF or WOFF2
+ if (aFontDataLength >= sizeof(AutoSwap_PRUint32)) {
+ const AutoSwap_PRUint32* version =
+ reinterpret_cast<const AutoSwap_PRUint32*>(aFontData);
+ if (uint32_t(*version) == TRUETYPE_TAG('w', 'O', 'F', 'F')) {
+ return GFX_USERFONT_WOFF;
+ }
+ if (uint32_t(*version) == TRUETYPE_TAG('w', 'O', 'F', '2')) {
+ return GFX_USERFONT_WOFF2;
+ }
+ }
+
+ // tests for other formats here
+
+ return GFX_USERFONT_UNKNOWN;
+}
+
+static int DirEntryCmp(const void* aKey, const void* aItem) {
+ int32_t tag = *static_cast<const int32_t*>(aKey);
+ const TableDirEntry* entry = static_cast<const TableDirEntry*>(aItem);
+ return tag - int32_t(entry->tag);
+}
+
+/* static */
+TableDirEntry* gfxFontUtils::FindTableDirEntry(const void* aFontData,
+ uint32_t aTableTag) {
+ const SFNTHeader* header = reinterpret_cast<const SFNTHeader*>(aFontData);
+ const TableDirEntry* dir = reinterpret_cast<const TableDirEntry*>(header + 1);
+ return static_cast<TableDirEntry*>(
+ bsearch(&aTableTag, dir, uint16_t(header->numTables),
+ sizeof(TableDirEntry), DirEntryCmp));
+}
+
+/* static */
+hb_blob_t* gfxFontUtils::GetTableFromFontData(const void* aFontData,
+ uint32_t aTableTag) {
+ const TableDirEntry* dir = FindTableDirEntry(aFontData, aTableTag);
+ if (dir) {
+ return hb_blob_create(
+ reinterpret_cast<const char*>(aFontData) + dir->offset, dir->length,
+ HB_MEMORY_MODE_READONLY, nullptr, nullptr);
+ }
+ return nullptr;
+}
+
+nsresult gfxFontUtils::RenameFont(const nsAString& aName,
+ const uint8_t* aFontData,
+ uint32_t aFontDataLength,
+ FallibleTArray<uint8_t>* aNewFont) {
+ NS_ASSERTION(aNewFont, "null font data array");
+
+ uint64_t dataLength(aFontDataLength);
+
+ // new name table
+ static const uint32_t neededNameIDs[] = {NAME_ID_FAMILY, NAME_ID_STYLE,
+ NAME_ID_UNIQUE, NAME_ID_FULL,
+ NAME_ID_POSTSCRIPT};
+
+ // calculate new name table size
+ uint16_t nameCount = ArrayLength(neededNameIDs);
+
+ // leave room for null-terminator
+ uint32_t nameStrLength = (aName.Length() + 1) * sizeof(char16_t);
+ if (nameStrLength > 65535) {
+ // The name length _in bytes_ must fit in an unsigned short field;
+ // therefore, a name longer than this cannot be used.
+ return NS_ERROR_FAILURE;
+ }
+
+ // round name table size up to 4-byte multiple
+ uint32_t nameTableSize =
+ (sizeof(NameHeader) + sizeof(NameRecord) * nameCount + nameStrLength +
+ 3) &
+ ~3;
+
+ if (dataLength + nameTableSize > UINT32_MAX) return NS_ERROR_FAILURE;
+
+ // bug 505386 - need to handle unpadded font length
+ uint32_t paddedFontDataSize = (aFontDataLength + 3) & ~3;
+ uint32_t adjFontDataSize = paddedFontDataSize + nameTableSize;
+
+ // create new buffer: old font data plus new name table
+ if (!aNewFont->AppendElements(adjFontDataSize, fallible))
+ return NS_ERROR_OUT_OF_MEMORY;
+
+ // copy the old font data
+ uint8_t* newFontData = reinterpret_cast<uint8_t*>(aNewFont->Elements());
+
+ // null the last four bytes in case the font length is not a multiple of 4
+ memset(newFontData + aFontDataLength, 0,
+ paddedFontDataSize - aFontDataLength);
+
+ // copy font data
+ memcpy(newFontData, aFontData, aFontDataLength);
+
+ // null out the last 4 bytes for checksum calculations
+ memset(newFontData + adjFontDataSize - 4, 0, 4);
+
+ NameHeader* nameHeader =
+ reinterpret_cast<NameHeader*>(newFontData + paddedFontDataSize);
+
+ // -- name header
+ nameHeader->format = 0;
+ nameHeader->count = nameCount;
+ nameHeader->stringOffset =
+ sizeof(NameHeader) + nameCount * sizeof(NameRecord);
+
+ // -- name records
+ uint32_t i;
+ NameRecord* nameRecord = reinterpret_cast<NameRecord*>(nameHeader + 1);
+
+ for (i = 0; i < nameCount; i++, nameRecord++) {
+ nameRecord->platformID = PLATFORM_ID_MICROSOFT;
+ nameRecord->encodingID = ENCODING_ID_MICROSOFT_UNICODEBMP;
+ nameRecord->languageID = LANG_ID_MICROSOFT_EN_US;
+ nameRecord->nameID = neededNameIDs[i];
+ nameRecord->offset = 0;
+ nameRecord->length = nameStrLength;
+ }
+
+ // -- string data, located after the name records, stored in big-endian form
+ char16_t* strData = reinterpret_cast<char16_t*>(nameRecord);
+
+ mozilla::NativeEndian::copyAndSwapToBigEndian(strData, aName.BeginReading(),
+ aName.Length());
+ strData[aName.Length()] = 0; // add null termination
+
+ // adjust name table header to point to the new name table
+ SFNTHeader* sfntHeader = reinterpret_cast<SFNTHeader*>(newFontData);
+
+ // table directory entries begin immediately following SFNT header
+ TableDirEntry* dirEntry =
+ FindTableDirEntry(newFontData, TRUETYPE_TAG('n', 'a', 'm', 'e'));
+ // function only called if font validates, so this should always be true
+ MOZ_ASSERT(dirEntry, "attempt to rename font with no name table");
+
+ uint32_t numTables = sfntHeader->numTables;
+
+ // note: dirEntry now points to 'name' table record
+
+ // recalculate name table checksum
+ uint32_t checkSum = 0;
+ AutoSwap_PRUint32* nameData =
+ reinterpret_cast<AutoSwap_PRUint32*>(nameHeader);
+ AutoSwap_PRUint32* nameDataEnd = nameData + (nameTableSize >> 2);
+
+ while (nameData < nameDataEnd) checkSum = checkSum + *nameData++;
+
+ // adjust name table entry to point to new name table
+ dirEntry->offset = paddedFontDataSize;
+ dirEntry->length = nameTableSize;
+ dirEntry->checkSum = checkSum;
+
+ // fix up checksums
+ uint32_t checksum = 0;
+
+ // checksum for font = (checksum of header) + (checksum of tables)
+ uint32_t headerLen = sizeof(SFNTHeader) + sizeof(TableDirEntry) * numTables;
+ const AutoSwap_PRUint32* headerData =
+ reinterpret_cast<const AutoSwap_PRUint32*>(newFontData);
+
+ // header length is in bytes, checksum calculated in longwords
+ for (i = 0; i < (headerLen >> 2); i++, headerData++) {
+ checksum += *headerData;
+ }
+
+ uint32_t headOffset = 0;
+ dirEntry = reinterpret_cast<TableDirEntry*>(newFontData + sizeof(SFNTHeader));
+
+ for (i = 0; i < numTables; i++, dirEntry++) {
+ if (dirEntry->tag == TRUETYPE_TAG('h', 'e', 'a', 'd')) {
+ headOffset = dirEntry->offset;
+ }
+ checksum += dirEntry->checkSum;
+ }
+
+ NS_ASSERTION(headOffset != 0, "no head table for font");
+
+ HeadTable* headData = reinterpret_cast<HeadTable*>(newFontData + headOffset);
+
+ headData->checkSumAdjustment = HeadTable::HEAD_CHECKSUM_CALC_CONST - checksum;
+
+ return NS_OK;
+}
+
+// This is only called after the basic validity of the downloaded sfnt
+// data has been checked, so it should never fail to find the name table
+// (though it might fail to read it, if memory isn't available);
+// other checks here are just for extra paranoia.
+nsresult gfxFontUtils::GetFullNameFromSFNT(const uint8_t* aFontData,
+ uint32_t aLength,
+ nsACString& aFullName) {
+ aFullName = "(MISSING NAME)"; // should always get replaced
+
+ const TableDirEntry* dirEntry =
+ FindTableDirEntry(aFontData, TRUETYPE_TAG('n', 'a', 'm', 'e'));
+
+ // should never fail, as we're only called after font validation succeeded
+ NS_ENSURE_TRUE(dirEntry, NS_ERROR_NOT_AVAILABLE);
+
+ uint32_t len = dirEntry->length;
+ NS_ENSURE_TRUE(aLength > len && aLength - len >= dirEntry->offset,
+ NS_ERROR_UNEXPECTED);
+
+ AutoHBBlob nameBlob(hb_blob_create((const char*)aFontData + dirEntry->offset,
+ len, HB_MEMORY_MODE_READONLY, nullptr,
+ nullptr));
+ nsresult rv = GetFullNameFromTable(nameBlob, aFullName);
+
+ return rv;
+}
+
+nsresult gfxFontUtils::GetFullNameFromTable(hb_blob_t* aNameTable,
+ nsACString& aFullName) {
+ nsAutoCString name;
+ nsresult rv = gfxFontUtils::ReadCanonicalName(
+ aNameTable, gfxFontUtils::NAME_ID_FULL, name);
+ if (NS_SUCCEEDED(rv) && !name.IsEmpty()) {
+ aFullName = name;
+ return NS_OK;
+ }
+ rv = gfxFontUtils::ReadCanonicalName(aNameTable, gfxFontUtils::NAME_ID_FAMILY,
+ name);
+ if (NS_SUCCEEDED(rv) && !name.IsEmpty()) {
+ nsAutoCString styleName;
+ rv = gfxFontUtils::ReadCanonicalName(
+ aNameTable, gfxFontUtils::NAME_ID_STYLE, styleName);
+ if (NS_SUCCEEDED(rv) && !styleName.IsEmpty()) {
+ name.Append(' ');
+ name.Append(styleName);
+ aFullName = name;
+ }
+ return NS_OK;
+ }
+
+ return NS_ERROR_NOT_AVAILABLE;
+}
+
+nsresult gfxFontUtils::GetFamilyNameFromTable(hb_blob_t* aNameTable,
+ nsACString& aFamilyName) {
+ nsAutoCString name;
+ nsresult rv = gfxFontUtils::ReadCanonicalName(
+ aNameTable, gfxFontUtils::NAME_ID_FAMILY, name);
+ if (NS_SUCCEEDED(rv) && !name.IsEmpty()) {
+ aFamilyName = name;
+ return NS_OK;
+ }
+ return NS_ERROR_NOT_AVAILABLE;
+}
+
+enum {
+#if defined(XP_MACOSX)
+ CANONICAL_LANG_ID = gfxFontUtils::LANG_ID_MAC_ENGLISH,
+ PLATFORM_ID = gfxFontUtils::PLATFORM_ID_MAC
+#else
+ CANONICAL_LANG_ID = gfxFontUtils::LANG_ID_MICROSOFT_EN_US,
+ PLATFORM_ID = gfxFontUtils::PLATFORM_ID_MICROSOFT
+#endif
+};
+
+nsresult gfxFontUtils::ReadNames(const char* aNameData, uint32_t aDataLen,
+ uint32_t aNameID, int32_t aPlatformID,
+ nsTArray<nsCString>& aNames) {
+ return ReadNames(aNameData, aDataLen, aNameID, LANG_ALL, aPlatformID, aNames);
+}
+
+nsresult gfxFontUtils::ReadCanonicalName(hb_blob_t* aNameTable,
+ uint32_t aNameID, nsCString& aName) {
+ uint32_t nameTableLen;
+ const char* nameTable = hb_blob_get_data(aNameTable, &nameTableLen);
+ return ReadCanonicalName(nameTable, nameTableLen, aNameID, aName);
+}
+
+nsresult gfxFontUtils::ReadCanonicalName(const char* aNameData,
+ uint32_t aDataLen, uint32_t aNameID,
+ nsCString& aName) {
+ nsresult rv;
+
+ nsTArray<nsCString> names;
+
+ // first, look for the English name (this will succeed 99% of the time)
+ rv = ReadNames(aNameData, aDataLen, aNameID, CANONICAL_LANG_ID, PLATFORM_ID,
+ names);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ // otherwise, grab names for all languages
+ if (names.Length() == 0) {
+ rv = ReadNames(aNameData, aDataLen, aNameID, LANG_ALL, PLATFORM_ID, names);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+
+#if defined(XP_MACOSX)
+ // may be dealing with font that only has Microsoft name entries
+ if (names.Length() == 0) {
+ rv = ReadNames(aNameData, aDataLen, aNameID, LANG_ID_MICROSOFT_EN_US,
+ PLATFORM_ID_MICROSOFT, names);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ // getting really desperate now, take anything!
+ if (names.Length() == 0) {
+ rv = ReadNames(aNameData, aDataLen, aNameID, LANG_ALL,
+ PLATFORM_ID_MICROSOFT, names);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+ }
+#endif
+
+ // return the first name (99.9% of the time names will
+ // contain a single English name)
+ if (names.Length()) {
+ aName.Assign(names[0]);
+ return NS_OK;
+ }
+
+ return NS_ERROR_FAILURE;
+}
+
+// Charsets to use for decoding Mac platform font names.
+// This table is sorted by {encoding, language}, with the wildcard "ANY" being
+// greater than any defined values for each field; we use a binary search on
+// both fields, and fall back to matching only encoding if necessary
+
+// Some "redundant" entries for specific combinations are included such as
+// encoding=roman, lang=english, in order that common entries will be found
+// on the first search.
+
+const uint16_t ANY = 0xffff;
+const gfxFontUtils::MacFontNameCharsetMapping
+ gfxFontUtils::gMacFontNameCharsets[] = {
+ {ENCODING_ID_MAC_ROMAN, LANG_ID_MAC_ENGLISH, MACINTOSH_ENCODING},
+ {ENCODING_ID_MAC_ROMAN, LANG_ID_MAC_ICELANDIC, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_ROMAN, LANG_ID_MAC_TURKISH, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_ROMAN, LANG_ID_MAC_POLISH, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_ROMAN, LANG_ID_MAC_ROMANIAN, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_ROMAN, LANG_ID_MAC_CZECH, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_ROMAN, LANG_ID_MAC_SLOVAK, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_ROMAN, ANY, MACINTOSH_ENCODING},
+ {ENCODING_ID_MAC_JAPANESE, LANG_ID_MAC_JAPANESE, SHIFT_JIS_ENCODING},
+ {ENCODING_ID_MAC_JAPANESE, ANY, SHIFT_JIS_ENCODING},
+ {ENCODING_ID_MAC_TRAD_CHINESE, LANG_ID_MAC_TRAD_CHINESE, BIG5_ENCODING},
+ {ENCODING_ID_MAC_TRAD_CHINESE, ANY, BIG5_ENCODING},
+ {ENCODING_ID_MAC_KOREAN, LANG_ID_MAC_KOREAN, EUC_KR_ENCODING},
+ {ENCODING_ID_MAC_KOREAN, ANY, EUC_KR_ENCODING},
+ {ENCODING_ID_MAC_ARABIC, LANG_ID_MAC_ARABIC, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_ARABIC, LANG_ID_MAC_URDU, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_ARABIC, LANG_ID_MAC_FARSI, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_ARABIC, ANY, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_HEBREW, LANG_ID_MAC_HEBREW, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_HEBREW, ANY, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_GREEK, ANY, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_CYRILLIC, ANY, X_MAC_CYRILLIC_ENCODING},
+ {ENCODING_ID_MAC_DEVANAGARI, ANY, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_GURMUKHI, ANY, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_GUJARATI, ANY, X_USER_DEFINED_ENCODING},
+ {ENCODING_ID_MAC_SIMP_CHINESE, LANG_ID_MAC_SIMP_CHINESE,
+ GB18030_ENCODING},
+ {ENCODING_ID_MAC_SIMP_CHINESE, ANY, GB18030_ENCODING}};
+
+const Encoding* gfxFontUtils::gISOFontNameCharsets[] = {
+ /* 0 */ WINDOWS_1252_ENCODING, /* US-ASCII */
+ /* 1 */ nullptr, /* spec says "ISO 10646" but does not specify encoding
+ form! */
+ /* 2 */ WINDOWS_1252_ENCODING /* ISO-8859-1 */
+};
+
+const Encoding* gfxFontUtils::gMSFontNameCharsets[] = {
+ /* [0] ENCODING_ID_MICROSOFT_SYMBOL */ UTF_16BE_ENCODING,
+ /* [1] ENCODING_ID_MICROSOFT_UNICODEBMP */ UTF_16BE_ENCODING,
+ /* [2] ENCODING_ID_MICROSOFT_SHIFTJIS */ SHIFT_JIS_ENCODING,
+ /* [3] ENCODING_ID_MICROSOFT_PRC */ nullptr,
+ /* [4] ENCODING_ID_MICROSOFT_BIG5 */ BIG5_ENCODING,
+ /* [5] ENCODING_ID_MICROSOFT_WANSUNG */ nullptr,
+ /* [6] ENCODING_ID_MICROSOFT_JOHAB */ nullptr,
+ /* [7] reserved */ nullptr,
+ /* [8] reserved */ nullptr,
+ /* [9] reserved */ nullptr,
+ /*[10] ENCODING_ID_MICROSOFT_UNICODEFULL */ UTF_16BE_ENCODING};
+
+struct MacCharsetMappingComparator {
+ typedef gfxFontUtils::MacFontNameCharsetMapping MacFontNameCharsetMapping;
+ const MacFontNameCharsetMapping& mSearchValue;
+ explicit MacCharsetMappingComparator(
+ const MacFontNameCharsetMapping& aSearchValue)
+ : mSearchValue(aSearchValue) {}
+ int operator()(const MacFontNameCharsetMapping& aEntry) const {
+ if (mSearchValue < aEntry) {
+ return -1;
+ }
+ if (aEntry < mSearchValue) {
+ return 1;
+ }
+ return 0;
+ }
+};
+
+// Return the Encoding object we should use to decode a font name
+// given the name table attributes.
+// Special return values:
+// X_USER_DEFINED_ENCODING One of Mac legacy encodings that is not a part
+// of Encoding Standard
+// nullptr unknown charset, do not attempt conversion
+const Encoding* gfxFontUtils::GetCharsetForFontName(uint16_t aPlatform,
+ uint16_t aScript,
+ uint16_t aLanguage) {
+ switch (aPlatform) {
+ case PLATFORM_ID_UNICODE:
+ return UTF_16BE_ENCODING;
+
+ case PLATFORM_ID_MAC: {
+ MacFontNameCharsetMapping searchValue = {aScript, aLanguage, nullptr};
+ for (uint32_t i = 0; i < 2; ++i) {
+ size_t idx;
+ if (BinarySearchIf(gMacFontNameCharsets, 0,
+ ArrayLength(gMacFontNameCharsets),
+ MacCharsetMappingComparator(searchValue), &idx)) {
+ return gMacFontNameCharsets[idx].mEncoding;
+ }
+
+ // no match, so try again finding one in any language
+ searchValue.mLanguage = ANY;
+ }
+ } break;
+
+ case PLATFORM_ID_ISO:
+ if (aScript < ArrayLength(gISOFontNameCharsets)) {
+ return gISOFontNameCharsets[aScript];
+ }
+ break;
+
+ case PLATFORM_ID_MICROSOFT:
+ if (aScript < ArrayLength(gMSFontNameCharsets)) {
+ return gMSFontNameCharsets[aScript];
+ }
+ break;
+ }
+
+ return nullptr;
+}
+
+template <int N>
+static bool StartsWith(const nsACString& string, const char (&prefix)[N]) {
+ if (N - 1 > string.Length()) {
+ return false;
+ }
+ return memcmp(string.Data(), prefix, N - 1) == 0;
+}
+
+// convert a raw name from the name table to an nsString, if possible;
+// return value indicates whether conversion succeeded
+bool gfxFontUtils::DecodeFontName(const char* aNameData, int32_t aByteLen,
+ uint32_t aPlatformCode, uint32_t aScriptCode,
+ uint32_t aLangCode, nsACString& aName) {
+ if (aByteLen <= 0) {
+ NS_WARNING("empty font name");
+ aName.SetLength(0);
+ return true;
+ }
+
+ auto encoding = GetCharsetForFontName(aPlatformCode, aScriptCode, aLangCode);
+
+ if (!encoding) {
+ // nullptr -> unknown charset
+#ifdef DEBUG
+ char warnBuf[128];
+ if (aByteLen > 64) aByteLen = 64;
+ SprintfLiteral(warnBuf,
+ "skipping font name, unknown charset %d:%d:%d for <%.*s>",
+ aPlatformCode, aScriptCode, aLangCode, aByteLen, aNameData);
+ NS_WARNING(warnBuf);
+#endif
+ return false;
+ }
+
+ if (encoding == X_USER_DEFINED_ENCODING) {
+#ifdef XP_MACOSX
+ // Special case for macOS only: support legacy Mac encodings
+ // that aren't part of the Encoding Standard.
+ if (aPlatformCode == PLATFORM_ID_MAC) {
+ CFStringRef str =
+ CFStringCreateWithBytes(kCFAllocatorDefault, (const UInt8*)aNameData,
+ aByteLen, aScriptCode, false);
+ if (str) {
+ CFIndex length = CFStringGetLength(str);
+ nsAutoString name16;
+ name16.SetLength(length);
+ CFStringGetCharacters(str, CFRangeMake(0, length),
+ (UniChar*)name16.BeginWriting());
+ CFRelease(str);
+ CopyUTF16toUTF8(name16, aName);
+ return true;
+ }
+ }
+#endif
+ NS_WARNING("failed to get the decoder for a font name string");
+ return false;
+ }
+
+ auto rv = encoding->DecodeWithoutBOMHandling(
+ nsDependentCSubstring(aNameData, aByteLen), aName);
+ return NS_SUCCEEDED(rv);
+}
+
+nsresult gfxFontUtils::ReadNames(const char* aNameData, uint32_t aDataLen,
+ uint32_t aNameID, int32_t aLangID,
+ int32_t aPlatformID,
+ nsTArray<nsCString>& aNames) {
+ NS_ASSERTION(aDataLen != 0, "null name table");
+
+ if (!aDataLen) {
+ return NS_ERROR_FAILURE;
+ }
+
+ // -- name table data
+ const NameHeader* nameHeader = reinterpret_cast<const NameHeader*>(aNameData);
+
+ uint32_t nameCount = nameHeader->count;
+
+ // -- sanity check the number of name records
+ if (uint64_t(nameCount) * sizeof(NameRecord) > aDataLen) {
+ NS_WARNING("invalid font (name table data)");
+ return NS_ERROR_FAILURE;
+ }
+
+ // -- iterate through name records
+ const NameRecord* nameRecord =
+ reinterpret_cast<const NameRecord*>(aNameData + sizeof(NameHeader));
+ uint64_t nameStringsBase = uint64_t(nameHeader->stringOffset);
+
+ uint32_t i;
+ for (i = 0; i < nameCount; i++, nameRecord++) {
+ uint32_t platformID;
+
+ // skip over unwanted nameID's
+ if (uint32_t(nameRecord->nameID) != aNameID) {
+ continue;
+ }
+
+ // skip over unwanted platform data
+ platformID = nameRecord->platformID;
+ if (aPlatformID != PLATFORM_ALL && platformID != uint32_t(aPlatformID)) {
+ continue;
+ }
+
+ // skip over unwanted languages
+ if (aLangID != LANG_ALL &&
+ uint32_t(nameRecord->languageID) != uint32_t(aLangID)) {
+ continue;
+ }
+
+ // add name to names array
+
+ // -- calculate string location
+ uint32_t namelen = nameRecord->length;
+ uint32_t nameoff =
+ nameRecord->offset; // offset from base of string storage
+
+ if (nameStringsBase + uint64_t(nameoff) + uint64_t(namelen) > aDataLen) {
+ NS_WARNING("invalid font (name table strings)");
+ return NS_ERROR_FAILURE;
+ }
+
+ // -- decode if necessary and make nsString
+ nsAutoCString name;
+
+ DecodeFontName(aNameData + nameStringsBase + nameoff, namelen, platformID,
+ uint32_t(nameRecord->encodingID),
+ uint32_t(nameRecord->languageID), name);
+
+ uint32_t k, numNames;
+ bool foundName = false;
+
+ numNames = aNames.Length();
+ for (k = 0; k < numNames; k++) {
+ if (name.Equals(aNames[k])) {
+ foundName = true;
+ break;
+ }
+ }
+
+ if (!foundName) aNames.AppendElement(name);
+ }
+
+ return NS_OK;
+}
+
+void gfxFontUtils::GetVariationData(
+ gfxFontEntry* aFontEntry, nsTArray<gfxFontVariationAxis>* aAxes,
+ nsTArray<gfxFontVariationInstance>* aInstances) {
+ MOZ_ASSERT(!aAxes || aAxes->IsEmpty());
+ MOZ_ASSERT(!aInstances || aInstances->IsEmpty());
+
+ if (!aFontEntry->HasVariations()) {
+ return;
+ }
+
+ // Some platforms don't offer a simple API to return the list of instances,
+ // so we have to interpret the 'fvar' table ourselves.
+
+ // https://www.microsoft.com/typography/otspec/fvar.htm#fvarHeader
+ struct FvarHeader {
+ AutoSwap_PRUint16 majorVersion;
+ AutoSwap_PRUint16 minorVersion;
+ AutoSwap_PRUint16 axesArrayOffset;
+ AutoSwap_PRUint16 reserved;
+ AutoSwap_PRUint16 axisCount;
+ AutoSwap_PRUint16 axisSize;
+ AutoSwap_PRUint16 instanceCount;
+ AutoSwap_PRUint16 instanceSize;
+ };
+
+ // https://www.microsoft.com/typography/otspec/fvar.htm#variationAxisRecord
+ struct AxisRecord {
+ AutoSwap_PRUint32 axisTag;
+ AutoSwap_PRInt32 minValue;
+ AutoSwap_PRInt32 defaultValue;
+ AutoSwap_PRInt32 maxValue;
+ AutoSwap_PRUint16 flags;
+ AutoSwap_PRUint16 axisNameID;
+ };
+ const uint16_t HIDDEN_AXIS = 0x0001; // AxisRecord flags value
+
+ // https://www.microsoft.com/typography/otspec/fvar.htm#instanceRecord
+ struct InstanceRecord {
+ AutoSwap_PRUint16 subfamilyNameID;
+ AutoSwap_PRUint16 flags;
+ AutoSwap_PRInt32 coordinates[1]; // variable-size array [axisCount]
+ // The variable-length 'coordinates' array may be followed by an
+ // optional extra field 'postScriptNameID'. We can't directly
+ // represent this in the struct, because its offset varies depending
+ // on the number of axes present.
+ // (Not currently used by our code here anyhow.)
+ // AutoSwap_PRUint16 postScriptNameID;
+ };
+
+ // Load the two font tables we need as harfbuzz blobs; if either is absent,
+ // just bail out.
+ AutoHBBlob fvarTable(
+ aFontEntry->GetFontTable(TRUETYPE_TAG('f', 'v', 'a', 'r')));
+ AutoHBBlob nameTable(
+ aFontEntry->GetFontTable(TRUETYPE_TAG('n', 'a', 'm', 'e')));
+ if (!fvarTable || !nameTable) {
+ return;
+ }
+ unsigned int len;
+ const char* data = hb_blob_get_data(fvarTable, &len);
+ if (len < sizeof(FvarHeader)) {
+ return;
+ }
+ // Read the fields of the table header; bail out if it looks broken.
+ auto fvar = reinterpret_cast<const FvarHeader*>(data);
+ if (uint16_t(fvar->majorVersion) != 1 || uint16_t(fvar->minorVersion) != 0 ||
+ uint16_t(fvar->reserved) != 2) {
+ return;
+ }
+ uint16_t axisCount = fvar->axisCount;
+ uint16_t axisSize = fvar->axisSize;
+ uint16_t instanceCount = fvar->instanceCount;
+ uint16_t instanceSize = fvar->instanceSize;
+ if (axisCount ==
+ 0 || // no axes?
+ // https://www.microsoft.com/typography/otspec/fvar.htm#axisSize
+ axisSize != 20 || // required value for current table version
+ // https://www.microsoft.com/typography/otspec/fvar.htm#instanceSize
+ (instanceSize != axisCount * sizeof(int32_t) + 4 &&
+ instanceSize != axisCount * sizeof(int32_t) + 6)) {
+ return;
+ }
+ // Check that axis array will not exceed table size
+ uint16_t axesOffset = fvar->axesArrayOffset;
+ if (axesOffset + uint32_t(axisCount) * axisSize > len) {
+ return;
+ }
+ // Get pointer to the array of axis records
+ auto axes = reinterpret_cast<const AxisRecord*>(data + axesOffset);
+ // Get address of instance array, and check it doesn't overflow table size.
+ // https://www.microsoft.com/typography/otspec/fvar.htm#axisAndInstanceArrays
+ auto instData = data + axesOffset + axisCount * axisSize;
+ if (instData + uint32_t(instanceCount) * instanceSize > data + len) {
+ return;
+ }
+ if (aInstances) {
+ aInstances->SetCapacity(instanceCount);
+ for (unsigned i = 0; i < instanceCount; ++i, instData += instanceSize) {
+ // Typed pointer to the current instance record, to read its fields.
+ auto inst = reinterpret_cast<const InstanceRecord*>(instData);
+ // Pointer to the coordinates array within the instance record.
+ // This array has axisCount elements, and is included in instanceSize
+ // (which depends on axisCount, and was validated above) so we know
+ // access to coords[j] below will not be outside the table bounds.
+ auto coords = &inst->coordinates[0];
+ gfxFontVariationInstance instance;
+ uint16_t nameID = inst->subfamilyNameID;
+ nsresult rv = ReadCanonicalName(nameTable, nameID, instance.mName);
+ if (NS_FAILED(rv)) {
+ // If no name was available for the instance, ignore it.
+ continue;
+ }
+ instance.mValues.SetCapacity(axisCount);
+ for (unsigned j = 0; j < axisCount; ++j) {
+ gfxFontVariationValue value = {axes[j].axisTag,
+ int32_t(coords[j]) / 65536.0f};
+ instance.mValues.AppendElement(value);
+ }
+ aInstances->AppendElement(std::move(instance));
+ }
+ }
+ if (aAxes) {
+ aAxes->SetCapacity(axisCount);
+ for (unsigned i = 0; i < axisCount; ++i) {
+ if (uint16_t(axes[i].flags) & HIDDEN_AXIS) {
+ continue;
+ }
+ gfxFontVariationAxis axis;
+ axis.mTag = axes[i].axisTag;
+ uint16_t nameID = axes[i].axisNameID;
+ nsresult rv = ReadCanonicalName(nameTable, nameID, axis.mName);
+ if (NS_FAILED(rv)) {
+ axis.mName.Truncate(0);
+ }
+ // Convert values from 16.16 fixed-point to float
+ axis.mMinValue = int32_t(axes[i].minValue) / 65536.0f;
+ axis.mDefaultValue = int32_t(axes[i].defaultValue) / 65536.0f;
+ axis.mMaxValue = int32_t(axes[i].maxValue) / 65536.0f;
+ aAxes->AppendElement(axis);
+ }
+ }
+}
+
+void gfxFontUtils::ReadOtherFamilyNamesForFace(
+ const nsACString& aFamilyName, const char* aNameData, uint32_t aDataLength,
+ nsTArray<nsCString>& aOtherFamilyNames, bool useFullName) {
+ const NameHeader* nameHeader = reinterpret_cast<const NameHeader*>(aNameData);
+
+ uint32_t nameCount = nameHeader->count;
+ if (nameCount * sizeof(NameRecord) > aDataLength) {
+ NS_WARNING("invalid font (name records)");
+ return;
+ }
+
+ const NameRecord* nameRecord =
+ reinterpret_cast<const NameRecord*>(aNameData + sizeof(NameHeader));
+ uint32_t stringsBase = uint32_t(nameHeader->stringOffset);
+
+ for (uint32_t i = 0; i < nameCount; i++, nameRecord++) {
+ uint32_t nameLen = nameRecord->length;
+ uint32_t nameOff =
+ nameRecord->offset; // offset from base of string storage
+
+ if (stringsBase + nameOff + nameLen > aDataLength) {
+ NS_WARNING("invalid font (name table strings)");
+ return;
+ }
+
+ uint16_t nameID = nameRecord->nameID;
+ if ((useFullName && nameID == NAME_ID_FULL) ||
+ (!useFullName &&
+ (nameID == NAME_ID_FAMILY || nameID == NAME_ID_PREFERRED_FAMILY))) {
+ nsAutoCString otherFamilyName;
+ bool ok = DecodeFontName(
+ aNameData + stringsBase + nameOff, nameLen,
+ uint32_t(nameRecord->platformID), uint32_t(nameRecord->encodingID),
+ uint32_t(nameRecord->languageID), otherFamilyName);
+ // add if not same as canonical family name
+ if (ok && otherFamilyName != aFamilyName &&
+ !aOtherFamilyNames.Contains(otherFamilyName)) {
+ aOtherFamilyNames.AppendElement(otherFamilyName);
+ }
+ }
+ }
+}
+
+#ifdef XP_WIN
+
+/* static */
+bool gfxFontUtils::IsCffFont(const uint8_t* aFontData) {
+ // this is only called after aFontData has passed basic validation,
+ // so we know there is enough data present to allow us to read the version!
+ const SFNTHeader* sfntHeader = reinterpret_cast<const SFNTHeader*>(aFontData);
+ return (sfntHeader->sfntVersion == TRUETYPE_TAG('O', 'T', 'T', 'O'));
+}
+
+#endif
+
+/* static */ bool gfxFontUtils::IsInServoTraversal() {
+ if (NS_IsMainThread()) {
+ return ServoStyleSet::IsInServoTraversal();
+ }
+
+ if (dom::GetCurrentThreadWorkerPrivate()) {
+ return false;
+ }
+
+ // The only permissible threads are the main thread, the worker thread, the
+ // servo threads. If the latter, we must be traversing.
+ bool traversing = ServoStyleSet::IsInServoTraversal();
+ MOZ_ASSERT(traversing);
+ return traversing;
+}
+
+/* static */ ServoStyleSet* gfxFontUtils::CurrentServoStyleSet() {
+ // If we are on a worker thread, we must not check for the current set since
+ // the main/servo threads may be busy in parallel.
+ if (dom::GetCurrentThreadWorkerPrivate()) {
+ return nullptr;
+ }
+
+ return ServoStyleSet::Current();
+}
+
+#ifdef DEBUG
+/* static */ void gfxFontUtils::AssertSafeThreadOrServoFontMetricsLocked() {
+ if (!dom::GetCurrentThreadWorkerPrivate()) {
+ AssertIsMainThreadOrServoFontMetricsLocked();
+ }
+}
+#endif
+
+#undef acceptablePlatform
+#undef isSymbol
+#undef isUVSEncoding
+#undef LOG
+#undef LOG_ENABLED